About Code Page Conversion
Siebel CRM supports the ASCII 5348 and EBCDIC 1140 code pages on DB2 for z/OS. If your current Siebel CRM release runs on a different code page, you must migrate to one of the supported code pages before upgrading to the current Siebel release.
Siebel Business Applications support the Unicode character set. On the z/OS platform, Siebel Business Applications only support the Unicode character set on DB2 for z/OS version 8 running in New Function Mode or later releases. Character conversions from Unicode code pages to ASCII and EBCDIC code pages on the z/OS host are performed by the z/OS Unicode Services; these conversions are required if Siebel Business Applications are to function correctly. For information on setting up the z/OS Unicode Services, see the IBM document about using Unicode Services on the IBM z/OS information center Web site at https://www.ibm.com/docs/en/zos/2.4.0?topic=environment-steps-setting-up-unicode-services
Check the Siebel schema code page before starting the Siebel upgrade to ensure characters on the target schema will display correctly. Schedule sufficient time to perform and test the code page conversion before beginning the upgrade. For advice and assistance on converting DB2 code pages, contact IBM.